Hearing aid



FIG. 1 is a front view of a hearing aid showing our new design;

FIG. 2 is a rear view thereof,

FIG. 3 is a top view thereof,

FIG. 4 is a bottom view thereof,

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof,

FIG. 7 is a perspective view thereof; and,

FIG. 8 is a cross-sectional view thereof, taken along line 8-8 of FIG.3.

The broken lines represent unclaimed portions of the hearing aid andform no part of the claimed design.

CLAIM We claim the ornamental design for a hearing aid, as shown anddescribed.